INSTALLATION: To remove concealed wall plates from back of flanges and mounting brackets, loosen setscrews. Mount each wall plate with prongs at top; secure with sheet-metal screws furnished by manufacturer at points indicated by an S. Engage mounting brackets onto prongs of wall plate, then secure into position by tightening setscrews at bottom of flanges. Note: Center-to-center of concealed wall plates must be within 1/16'' (1.6mm) of dimension shown. For partitions with particle-board or other solid core: Secure with sheet-metal screws furnished by manufacturer or provide through-bolts, nuts, and washers. For hollow-core metal partitions: Provide solid backing into which the furnished sheet-metal screws can be secured. If two units are installed back-to-back, then provide threaded sleeves and machine screws for the full thickness of partition. For masonry walls: Provide fiber plugs or expansion shields for use with sheet-metal screws furnished by manufacturer, or provide 1/8'' (3mm) toggle bolts or expansion bolts. For plaster or dry wall construction: Provide concealed backing to comply with local building codes, then secure the unit with sheet-metal screws furnished.